Full Idea
It struck Kant (to put it crudely) that there are some things which are necessarily true of the world, revealed when we consider what is required for mathematics - indeed, thinking in general - to make sense.
Gist of Idea
Kant thought worldly necessities are revealed by what maths needs to make sense
Source
report of Immanuel Kant (Critique of Pure Reason [1781]) by Michael Morris - Guidebook to Wittgenstein's Tractatus Intro
Book Reference
Morris,Michael: 'Guidebook to Wittgenstein's Tractatus' [Routledge 2008], p.15
A Reaction
This is given as background the Wittgenstein's Tractatus. He disagrees with Kant because logic is not synthetic. I see a strong connection with the stoic belief that the natural world is intrinsically rational.
Related Idea
Idea 23495 The tautologies of logic show the logic of language and the world [Wittgenstein]